Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to contribute
+
+Thank you for reading this, we are always in need of volunteer developers to help this project remain strong.
+
+## Testing
+
+We require that all new submitted code be thoroughly tested. 
+
+Code submitted without any unit testing will be rejected. To run the test coverage locally, run ```gradle jacocoReport``` and review the results in build/reports/jacoco
+
+## Submitting changes
+
+Please send a [GitHub Pull Request to MinesJTK/jtk](https://github.com/MinesJTK/jtk/pull/new/master) with a clear list of what you've done. 
+
+## Coding conventions
+
+Start reading our code and you'll get the hang of it. We optimize for readability:
+
+  * We indent using two (2) spaces (soft tabs)
+  * We always line break if the code exceeds 78 columns in width.
+  * We document every public and protected method using official javadoc documentation.
+  * We use standard camelCase nomenclature for methods and variables, no under_scoring.
+  * This is open source software. Consider the people who will read your code and make it legible for them.
+
+Thank you!